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The SSL2109AT is a high-efficient controller IC for non-dimmable LED solutions. The SSL2109ADB1098 demo board is a non-isolated buck converter solution for small to medium size LED retrofit lamp applications (bulb shape). It controls a constant current through the LEDs from a rectified 230 VAC mains input voltage, with a high power factor >0.9. This 12 W demo board is optimized for a LED string voltage of 70 V / 150 mA. The output voltage can be configured between 30 V and 130 V. The SSL2109AT has an integrated start-up JFET to further improve the overall efficiency.This demoboard is obsolete and not recommended for use. Consider using SSL5018DB1125 instead.